Weak alkaline treatment of wheat and pearl millet straw for enhanced biogas production and its economic analysis

Kumar, Subodh; Gandhi, Paras; Yadav, Monika; Paritosh, Kunwar; Pareek, Nidhi; Vivekanand, Vivekanand

doi:10.1016/j.renene.2019.02.133

Cited by 63 publications

(22 citation statements)

References 42 publications

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“…These components showed mainly alkanes, aromatic groups, and different functional groups, such as ester, ketone, and alcohol in their structures [34,39]. Similar to that reported in the literature [15,40,41], all samples presented two main absorbance regions: the first one, in wavelengths in the range of 700-1800 cm −1 , and the second one at higher wavelengths corresponding to the range 2800-3500 cm −1 .…”

Section: Changes In Functional Groupssupporting

confidence: 83%

“…The absorption band at 1640 and 1600 cm −1 is originated from lignin, which includes C = C stretching of aromatic ring and aromatic skeleton vibration of C = C, respectively [41]. The intensity of these peaks decreased for the oat straw submitted to acid + thermal (e), alkaline (c), acid (b), and alkaline + thermal (f) pretreatments and is related to the removal of lignin.…”

Section: Changes In Functional Groupsmentioning

confidence: 98%

“…The peak of 2920 cm −1 correspondent to C-H n and related to asymmetric methylene stretching of cellulose, hemicellulose, and lignin becomes weaker with acid pretreatment (b) [41]. For oat straw submitted to thermal (d), acid + thermal (e), alkaline + thermal (f), and alkaline pretreatments (c), a peak formation was observed in 2850 cm −1 , also related to the C-H n stretching and characteristic of hemicellulose compounds [42].…”

Section: Changes In Functional Groupsmentioning

confidence: 99%

“…Changes in the intensity of the peaks 1370 and 1318 cm −1 are detected to acid + thermal (e), alkaline + thermal (f), alkaline (c), and acid (b) pretreated oat straw. These bands are related to aliphatic C-H deformation vibration and C-H 2 wagging of cellulose, respectively [41].…”

Section: Changes In Functional Groupsmentioning

confidence: 99%

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Anaerobic Co-Digestion of Tannery Wastes and Untreated/Pretreated Oat Straw

et al. 2021

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The combination of carbon and nitrogen-rich co-substrates results in a better balance and increases the stability of the anaerobic co-digestion (AcoD) process. In this work, the AcoD process of waste from the leather industry (shavings and sludge) with waste from agriculture (oat straw) was assessed with regard to the energy (biogas production) and waste treatment efficiency (reduction of organic matter). The results indicate that the addition of untreated oat straw improved the AcoD process, increasing biogas production (25.44 mL of cumulative biogas/g of VSS added) by almost 60% when compared to the AcoD of only leather waste (16.17 mL/gVSS). Also, the effect of acid, alkaline, thermal, and the combination of these pretreatment techniques was evaluated on the lignocellulosic composition of oat straw and on methane yields. Pretreatments improved the characteristics and bioavailability of oat straw, particularly in methodologies that use alkali, with a significant increase in cellulose content accompanied by a decrease in hemicellulose and lignin content. However, the possible formation of secondary products or sterilization of important microorganisms did not reflect in a greater production of biogas: 21.06 mL/gVSS for oat straw pretreated only with HCl and 21.91 mL/gVSS for oat straw pretreated with HCl in autoclave; 5.20 mL/gVSS for oat straw pretreated with NaOH; and 3.43 mL/gVSS for oat straw pretreated with NaOH in autoclave; thermal pretreatment probably has generated toxic compounds from hemicellulose and cellulose degradation, which inhibited the AcoD process and, as consequence, virtually no biogas was produced.

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Section: Changes In Functional Groupssupporting

confidence: 83%

Section: Changes In Functional Groupsmentioning

confidence: 98%

Section: Changes In Functional Groupsmentioning

confidence: 99%

Section: Changes In Functional Groupsmentioning

confidence: 99%

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Anaerobic Co-Digestion of Tannery Wastes and Untreated/Pretreated Oat Straw

et al. 2021

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“…In order to improve the hydrolysis of larger molecules of organic matter, a pretreatment stage can be implemented. It can employ technologies divided into three groups: physical methods (thermal pretreatment, sonification, manipulation of physicochemical parameters), chemical ones (acid, alkaline, or enzymatic processing), and ensiling . Acceleration of the first stage facilitates the course of the subsequent stage and has a significant effect on the efficiency of the process and the amount of biogas yield.…”

Section: Stages Of Admentioning

confidence: 99%

Intensification of biogas production using various technologies: A review

et al. 2020

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Summary Anaerobic digestion (AD) is an organic matter conversion technology which offers a wide range of options for production of biogas from organic biomass, providing an excellent opportunity to convert abundant bioresources into safe, eco‐friendly, renewable energy. Important factors in the process of AD are the biodiversity of microorganisms, chemical load of oxygen demand, and content of water and total solids. A challenge for the future is to find technologies that will maximally enhance biogas production and to find pathways for biogas to supersede well‐established technologies and practices in the contemporary heavily fossil fuel‐based energy system. Current studies on technologies of biogas production indicate a number of possibilities of using appropriate biological and physicochemical additives, like added enzymes or fruit pomace, as well as immobilizing microorganisms on biofilters. Anaerobic biorefinery is an emerging concept that generates not only bioenergy but also high‐value biochemical products from the same feedstock. This study is a review of articles describing the intensification of biogas production by using various technologies.

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